Is it time to start calling out bad cyclists?

By the way can people stop quoting bcr, I've got him on ignore and even just the quoted bits are making me unhappy.

You are missing out :)

I can imagine the gridlocked scenes around london as people rummage in their bag looking for their stickers/fliers in silence, holding up all the other road users in the process. In which time the person who needed the advice has long since pootled off down the road.
Or do we all need to go around with one of these on our bars?

Somehow, friendly advice/calling them a cunt seems far, far more logical.

Yeah - where and when are we supposed to hand out all this advice ?
I'm not stopping and I'm keeping my eyes on the road.